Add the olive oil to a large pot over medium heat. Once the oil is hot, add the onion, celery, and carrot. Cook, stirring occasionally, for about 7-9 minutes or until the onion is softened. Add the garlic, black pepper, and fresh herbs, and cook for another 2 minutes.
Add the flour slowly while stirring the vegetables to coat them with it. Once all of the flour is added, cook for about 1 minute while constantly stirring. Very slowly add the white wine and vegetable broth, about 1/4 cup at a time, stirring continuously so that the liquid and flour are incorporated with no lumps.
Stir in the potato, sweet potato, tomato paste, soy sauce, nutritional yeast, liquid smoke, and marmite. Bring to a gentle boil, then reduce to a simmer. Cook uncovered, stirring occasionally, until vegetables are tender and stew is thickened, 20-30 minutes.
Stir in the frozen peas and red wine vinegar, and cook for another 5 minutes or until peas are warm. Season to taste with salt and pepper, and additional vinegar if desired. Serve hot.
Video
Notes
FRESH HERBS: I buy the "Poultry Blend" packet at my grocery store, which contains thyme, rosemary and sage, and use equal amounts of each. You can mix and match depending on what you prefer and is available; I use 1 tbsp of each herb. The total should be 3 tablespoons.